Clock Functions - Omron CJ - PROGRAMMING MANUAL 08-2008 Programming Manual

Startup Settings and Maintenance
Procedure
1,2,3...
6-6-6

Clock Functions

326
Note The CS1G/H-CPU@@ (-V1) and CJ1@-CPU@@ CPU Units do not support
this function.
1. Set the Disable Setting for Power OFF Interrupts in A530 to A5A5 Hex to
enable disabling Power OFF Interrupts.
2. Enable disabling Power OFF Interrupts in the PLC Setup (this is the default
setting).
3. Use DI(693) to disable interrupts before the program section to be protect-
ed and then use EI(694) to enable interrupts after the section. All instruc-
tions between DI(693) and EI(694) will be completed before the Power
OFF Interrupt is executed even if the power interruption occurs while exe-
cuting the instructions between DI(693) and EI(694).
Execution condition
Power supply drops
below 85% of rated
value (80% for DC
power supplies).
D
I
Power OFF
detection time
+ Power OFF
detection
delay
Related Settings
Name
Disable Setting
for Power OFF
Interrupts
The CS/CJ-series PLCs have the following clock functions:
• Monitoring of the time that power interruptions occurred
• Monitoring of the time that the PLC was turned on
• Monitoring of the total time that the PLC has been on
Note The CS1G/H-CPU@@(-V1) and CJ1@-CPU@@ CPU Units are shipped with-
out the backup battery installed, and the CPU Unit's internal clock will be read
DI
EI
CPU Unit reset
Power interruption
(forced end)
detected.
▼
Instructions executed
E
through EI(694).
I
10 ms - Power
OFF detection
delay (Power OFF
confirmation time)
Address
A530 Enables using DI(693) to disable power OFF inter-
rupt processing (except for execution of the Power
OFF Interrupt Task) until EI(694) is executed.
A5A5 Hex: Enables using DI(693) to disable power
OFF interrupt processing
Any other value: Disables using DI(693) to disable
power OFF interrupt processing
Section 6-6
Interrupts disabled.
Power interrupted.
Instructions executed.
Interrupts enabled, causing
CPU Unit to be reset.
Stop
Meaning